RHSA-2026:21381

Vulnerability from csaf_redhat - Published: 2026-05-27 16:24 - Updated: 2026-05-28 02:41
Summary
Red Hat Security Advisory: thunderbird security update
Severity
Important
Notes
Topic: An update for thunderbird is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-8388) * firefox: Other issue in the JavaScript Engine component (CVE-2026-8391) * firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401) * firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956) * firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151 (CVE-2026-8975) * firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955) * firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component (CVE-2026-8968) * firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component (CVE-2026-8954) * firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-8958) * firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-8946) * firefox: Privilege escalation in the Security component (CVE-2026-8970) * firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950) * firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974) * firefox: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-8953) * firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component (CVE-2026-8959) * firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961) * firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947) * firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962) * firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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CVE-2026-8388

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Incorrect boundary conditions in the JavaScript Engine: JIT component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-8391

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Other issue in the JavaScript Engine component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-475 - Undefined Behavior for Input to API
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-8401

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape in the Profile Backup component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-653 - Improper Isolation or Compartmentalization
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-8946

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Incorrect boundary conditions in the Audio/Video: Web Codecs component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-8947

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Bindings (WebIDL) component

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-8950

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Same-origin policy bypass in the Networking: HTTP component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8953

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the Disability Access APIs component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-825 - Expired Pointer Dereference
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8954

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Incorrect boundary conditions, integer overflow in the Audio/Video component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-190 - Integer Overflow or Wraparound
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8955

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the DOM: Workers component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-266 - Incorrect Privilege Assignment
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8956

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Integer overflow in the Networking: JAR component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-190 - Integer Overflow or Wraparound
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8957

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the Enterprise Policies component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-266 - Incorrect Privilege Assignment
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8958

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Information disclosure, sandbox escape in the Security: Process Sandboxing component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-403 - Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8959

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-653 - Improper Isolation or Compartmentalization
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8961

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Spoofing issue in the Form Autofill component

3.4 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
CWE-472 - External Control of Assumed-Immutable Web Parameter
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Low
CVE-2026-8962

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Mitigation bypass in the DOM: Security component

3.4 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
CWE-358 - Improperly Implemented Security Check for Standard
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Low
CVE-2026-8968

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component

3.4 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Low
CVE-2026-8970

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the Security component

3.4 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
CWE-266 - Incorrect Privilege Assignment
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Low
CVE-2026-8974

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Moderate
CVE-2026-8975

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debuginfo-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:thunderbird-debugsource-0:140.11.0-1.el9_8.x86_64 —
Vendor Fix fix
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:21381 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2476469 external
https://bugzilla.redhat.com/show_bug.cgi?id=2476475 external
https://bugzilla.redhat.com/show_bug.cgi?id=2476492 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479839 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479840 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479842 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479846 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479847 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479848 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479849 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479852 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479853 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479855 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479860 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479861 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479871 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479873 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479876 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479880 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-8388 self
https://bugzilla.redhat.com/show_bug.cgi?id=2476469 external
https://www.cve.org/CVERecord?id=CVE-2026-8388 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8388 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8391 self
https://bugzilla.redhat.com/show_bug.cgi?id=2476475 external
https://www.cve.org/CVERecord?id=CVE-2026-8391 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8391 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8401 self
https://bugzilla.redhat.com/show_bug.cgi?id=2476492 external
https://www.cve.org/CVERecord?id=CVE-2026-8401 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8401 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8946 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479849 external
https://www.cve.org/CVERecord?id=CVE-2026-8946 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8946 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8947 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479873 external
https://www.cve.org/CVERecord?id=CVE-2026-8947 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8947 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8950 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479853 external
https://www.cve.org/CVERecord?id=CVE-2026-8950 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8950 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8953 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479860 external
https://www.cve.org/CVERecord?id=CVE-2026-8953 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8953 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8954 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479847 external
https://www.cve.org/CVERecord?id=CVE-2026-8954 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8954 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8955 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479842 external
https://www.cve.org/CVERecord?id=CVE-2026-8955 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8955 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8956 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479839 external
https://www.cve.org/CVERecord?id=CVE-2026-8956 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8956 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8957 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479880 external
https://www.cve.org/CVERecord?id=CVE-2026-8957 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8957 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8958 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479848 external
https://www.cve.org/CVERecord?id=CVE-2026-8958 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8958 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8959 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479861 external
https://www.cve.org/CVERecord?id=CVE-2026-8959 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8959 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8961 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479871 external
https://www.cve.org/CVERecord?id=CVE-2026-8961 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8961 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8962 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479876 external
https://www.cve.org/CVERecord?id=CVE-2026-8962 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8962 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8968 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479846 external
https://www.cve.org/CVERecord?id=CVE-2026-8968 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8968 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8970 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479852 external
https://www.cve.org/CVERecord?id=CVE-2026-8970 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8970 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8974 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479855 external
https://www.cve.org/CVERecord?id=CVE-2026-8974 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8974 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
https://access.redhat.com/security/cve/CVE-2026-8975 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479840 external
https://www.cve.org/CVERecord?id=CVE-2026-8975 external
https://nvd.nist.gov/vuln/detail/CVE-2026-8975 external
https://www.mozilla.org/security/advisories/mfsa2… external
https://www.mozilla.org/security/advisories/mfsa2… external
To clipboard 

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        "category": "summary",
        "text": "An update for thunderbird is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Mozilla Thunderbird is a standalone mail and newsgroup client.\n\nSecurity Fix(es):\n\n* firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-8388)\n\n* firefox: Other issue in the JavaScript Engine component (CVE-2026-8391)\n\n* firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401)\n\n* firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956)\n\n* firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151 (CVE-2026-8975)\n\n* firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955)\n\n* firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component (CVE-2026-8968)\n\n* firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component (CVE-2026-8954)\n\n* firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-8958)\n\n* firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-8946)\n\n* firefox: Privilege escalation in the Security component (CVE-2026-8970)\n\n* firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950)\n\n* firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974)\n\n* firefox: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-8953)\n\n* firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component (CVE-2026-8959)\n\n* firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961)\n\n* firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947)\n\n* firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962)\n\n* firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
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    }
  ]
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.